I don't think either is the future for either team without injuries in front of them. McGuire wins by a smidge but the Jets are Forte-in out with Powell keeping the satellite position next season if they do keep him. But they are drafting a back and if they don't, somebody is in major trouble.
As far as GB goes, the job is split between Monty and Jones with Williams coming in now and then. Neither are buys though in my opinion.
But...if you can convince people to believe either one are the future of those teams, get what you can out of them. Of course hold Williams at the time being and watch his value increase a little as GB continues to feed the ball to an underperformed backup.

24 Player Roster/12 Team/PPR/IDP/PPT(Point Per Tackle)
4 player Taxi Squad